Attachment plug



Oct. 5 1926.

v N. c. BUTLER ATTACHMENT PLUG Filed Sept. 25. 1919 Patented Get. 5, 1926.

` weiser LP iT'E, N T @FE EC E "NATHAN C. BUTLER, F GLEVELAND"IIEIGHTS, OHIO, ASSIGNOR OF ONE-THIRD'TO FRANK LSSESSIONS,OIFiLAKENOOD, O'IIO, ANI) vOll'll.-TI'IIRD TOROBESON B. WOL- GOTT, OF CIEFEIVIEILAND-'HIEUG'HTS;k OHIO.

, ATTACHMENT PLUG.

YApplica-tion 'led September 25, 19.19. Serial No. 326,188.

My invention `relates to attachment plugs such as are 'used for connecting electric ef;- tension cords or wiresvto` lamp .socketsor vother receptacles lfor. the purpose of con- 5. ducting current to` portable electric translating devices.

Among the objects of-myinvention are the provision of Van 'attachmentlplug toA which the'conductors may be connected with.- out the use of solder; thefprovision of an attachment plug composed of onlythree parts; the provision of` an attachment plug -which can be easily manufactured at low costand which shall be of simpl-e but rugged and durableV construction andthe provision of an attachment plug in which each of the wires connected to it leads away from its binding-screw inra 'direction parallelv to the axis of the binding-screw .and at a .right angle to that portion of the-wirewhich is under ,thel screw -hea'dor vflange which enables it to withstand strongpulls on the extension cord without being loosened' from the plug.

I attain these'andffother objects by the use ofthe device illustrated in theaccompanying drawings in which Fig. 1 is a side'elevation'ofa complete attachment plug made in accordance with my invention; YI+`igz2`is 'arsplan view of the Yattachment plug shown inFig. 1; Fig. 3 is a section on line III-III of Fig. 2; Fig. 4 is a simi-lar'view toFig. 3 but-shows only the body member f the attachmentplug; Fig. 5 is a plan andj-F ig. 6 is a longitudinal section of theheaded-central-terminal or contact binding-screw; 'Fi'gf is a-side elevation of the body member with the centralterminal binding-screw molded n in place;

contact member; Fig. 9 is la fragmentary plan view of amodification-of my invention and Fig. 10 is a fragmentary section on line X-X ofFig. 9.

'Referring to the Vdrawings,1.:is thev body member which I prefer to make entirely of insulation although its construction may be modified by molding Vone orrinore metal parts in it in the manner shown in Figs. 9 and 10, which will be zfurther described. rIhe body member,`1may have an enlarged collar, 2, formed upon it. The periphery of the collar, 2, and the adjacent end of the bo`dy,`1, may be knurfled oriiuted ina well Fig. S isa longitudinal section of thesheli--- per end of the body, 1, -as seen in Fig. 4, 00

the longitudinal aperture, 3, is provided with an -internal thread, 4, and may be .provided with a counterbore, 5, for the recepl `tion of a: headed central-terminal bindingscrew, 6.

The shank, 7, of screw, 6, is 55 threaded to fit the threaded aperture, 4, in the body member and has a longitudinal hole, y8, entending through it. `The head of screw, 6, is provided with a slot at'9 which slot at one or both of its ends 'extends clear 70 through the head. The .lower end of the hole, S, may be tapered or countersunk as shown at 10 to facilitate the entrance of the wire which is to be connected to this centralterminal of the attachment plug. It will be observed that the central terminal member is detachably secured in the aperture, 8, to the body member, 1. I prefer tomake the shank of the body member, 1, of two dierent diameters, the 4larger of which is threaded as shown at 11 and terminates in an annular transverse shoulder, 12,' where the diameter ofthe body, 1, becomes smaller as seen at 13. yFrom the longitudinal hole, 3, I provide an outlet 95 opening, 14, leading to the periphery of the externally threaded portion of the -body member and particularly to the shoulder, 12. Upon the externally threaded shank, .11,V of the body, 1, is screwed the metal sleeve or shell-contact, 15. The shell-contact is preferably made withan annular shoulder, 16, adapted, when the shell is screwed on to the body member, to coact with the shoulder, 12, to firmly bindV and to contact with the end of the conductor, 17, which is to be electrically connected to the shell, 15; The other conductor, 18, which is to be secured to the central-terminal ofV theL .attachment plug passes through the longitudinal-hole, 3, of the'body, through the hole8, inthe centralterminal binding-screw, 6,throngh the slot, 9, andtunder the head of the binding-screw, 6, and issecured in this position-by tightening the binding-screw, 6, in the threaded hole, 4, ofthe body member. 19 is the insulated duplex conductor which embodies the-wires leading to the attachment plug,

In Fig. 7 I have shown the insulating body member, 1, with the central-contact bindingscrew, 6, molded in place. This is the manner in which I prefer to manufacture these parts although they may be manufactured in any other suitable way. In molding the binding-screw, 6, in place; it will be understood by those skilled in the art that the binding-screw is securely held in the mold while the material of which the body member, 1, is made is being molded. Alfter the body member is molded and cured the binding-screw, 6, may be partially unscrewed to admit the wire, 18, for the purpose of connecting it to the attachment plug.

In Figs. 9 and l0 I have shown a modified construction in which there are molded in place a metal nut, 2O and a metal ring, 21. It these parts be molded in place as shown in Figs. 9 and 1G the metal nut. 20, provides a stronger and more durabe thread for the binding-screw, 6, than the insulating` material of the body, 1, provides, and also provides a metal shoulder, 22, to receive the pressure of the conductor, 18, which is clamped to it by the binding-screw, 6. The ring, 21, provides a metal shoulder against which the conductor, 7, may be clamped by the contact shell, 15. Projections such as shown at 23 and 24 may be formed upon the members, 20 and 21, respectively, to prevent them from twisting out ot place when the contact members, 6 and 15, are tightened.

The advantages of my invention including that ot providing an attachment plug having the smallest possible number of parts will be apparent to those skilled in the art.

Having thus described my invention, I claim:

1. In an attachment plug, a body member Y of insulating material having an externally threaded portion and a portion of smaller diameter extending beyond said threaded portion terminating in an annular shoulder, a metal shell having an internal thread adapted to be screwed upon said threaded portion and also having` an inturned 'flange overhanging said shoulder, said body member having a central longitudinal hole extending through it for the reception of the wires to be connected to the plug, an outlet` opening` from said hole to sai-d shoulder, one oi' said wires being extended out through said outlet-opening and bent around and laid upon said annular shoulder so as to be clamped thereagainst by the flange on the metal shell, and a central contact to which the other wire is connected..

2.. In an attachment plug a body member of insulating material having an externally threaded shank, a metal shell having an internal thread iitted to said externally threaded shank and an external thread adapted to fit the thread of an incandescent lamp socket, said body member having a central longitudinal hole extending` tnrough it for the reception ot the wires connected to the attachment plug and a transverse outlet hole for that one ot said wires which is to be connected to said shell, and a headed central-contact member having a shank iitting a threaded portion of said central longitudinal hole, said central contact member having a longitudinal hole and a transverse slot adapted to receive that one olf said wires which is to be connected to said central contact member, means being provided tor holding said wire in said slot by a clamping action.

3. An attachment plug comprising-a body member or" insulating material, a central-Y terminal binding-screw at the end thereof, and a threaded contact sleeve on said body member, said body member' having a longitudinal hole. for the reception ot the, wires connected to the plug, said central-terminal binding-screw having acentral longitudinal hole and a transverse slot adapted to receive that one or" said wires which is to be connected to said central-terminal, means being provided or holding said wire in saiclslot by a clamping action.

4. In an attachment plug a body member ot insulating material having an externally threaded portion and a portion of smaller diameter extending beyond said threaded portion said threaded portion terminating in a transverse shoulder surrounding said portion of smaller diameter, a metal shell having an internal thread adapted to be screwed upon said threaded portion of said body member and an inturned flange adapted to abut upon said shoulder when said shell is screwed upon said body member. said bodv member having a central longitudinal hole extending through it 'tor the reception of the wires to be connected to the plug and an outlet opening from said hole to said shoulder for that one of said wires nhich is to be connected to said shell, the end portion ot this wire being bent around the body member and laid on said shoulder soV as to b clamped thereagainst by said ange, and a central-terminal binding-screw threaded into the end of said portion ot smaller diameter said screw having a central longitudinal hole and a transverse slot adapted to receive the end ot that wire` which is to loe connected to said central terminal.

5. An attachment plug comprising an insulating body having a tl readed shank; a shell screwed onto the shank; a centralscontact member screwed into the end Voft' said shank, said shank having a central longitudinal passageway extending therethrough and an outlet hole from said passageway to the periphery of said shank, and said central-contact having a slotted head and a central aperture adapted to receive the Wire which is to be connected to said centralthreadedv llO Contact, means being provided for holding tact member screwed on to said shanlr and having an annular flange at one end adapted to coact with said shoulder to bind and malte contact with one of the wiresconnected to said plug, and a central-terminal member in the form of 'a headed bintV ingscrew threaded into said `body and having a central longitudinal hole and a transverse slot adapted to receive and malte contact with the other one of the wires connected to 1 having an annular ange at one end adaptsaid plug. i

7. in an attachment plug a body member having an externally threaded shank, a men al shell having an internal thread litted to said externally threaded shank and an eirternal thread adapted to tit the thread Voli an incandescent lamp socket, said bodymember having a central longitudinal aperture extending through it for thereception o the -wires connected to thc attachment plug and a transverse outlet opening for that one oi said wires which is connected to said shell, and a headed central contact member having a shanlr detachably held in said central longitudinal hole in-said bodv member, said central cont ct member having a longitudinal hole and atransverse 'slot adapted to receive that one oic said wires which is connected to said central contact member.

8. An attachment plug comprising a body member of insulating' material, a centralterminal member detachably secured at one end to said body member, said body member having a longitudinal aperture. for the reception of the wires connected to the plug, said central-terminal having a longitudinal aperture and a transverse slot adapted to receive that one of saidwires which is to be connected to said central terminal, means being provided for holding said wire in said slot by a clamping action.

9. lin an attachment plug a body member of insulating material having an externally threaded portion and portion of smaller diameter extending beyond said threadec portion, said threaded portion terminating in a transverse shoulder surrounding said portion of said smaller diameter, a metal kshell having an internal thread adapted to be screwed upon said threaded portion of said body member and having an inturned flange adapted to abut upon said shoulder when said shell is screwed upon said body member, said body member having acentral longitudinal aperture extending through it for the reception of the wires connected to the plug and an outlet opening from said aperture to the periphery of said body adjacent to said shoulder :tor that one of said Wires which is to vbe connected to said shell and headed central terminal member detachably secured in said central longitudinal hole to said body, said cent-ral terminal member having a central'longitudinal hole and a transverse slot .adapted to receive the end ot that wire which is connected to said central terminal.

l0. ln an attachment plug, a body of insulating material having a lthreaded shank and a. transverse shoulder', a metal shell-contact member screwed on to said shank and ed to coact with said shoulder to bind and malte contact with one ot' the wires connected to said plug, said bony having a central longitudinal aperture and a transverse outlet opening from said aperture to the peripherv of said shanlr adjacent to said shoulder, and a central terminal-member deta hably secured .in said aperture to the end ot said bod4 i member, said central terminalmember hav'ng a head forming a shoulder adapted to coact with the endor" said body member to bind and make contact with the other one ot the wires connected to said plug, said central terminal-member having a central*longitudinal hole and having a transverse slot through said head said hole and said slot being adapted to receive that. one. or" said wires which is connected to said central terminal-member.

il. An attachment plugcomprising an insulating body having a passage 'formed therein, a shell upon the insulating'body, a conductor having electric connection with the shell, a headed tubular element disposed in said passage and provided with a conductor receiving opening, and a second conductor passing through s passage into said tubular element. and through said con ductor receiving opening, one end or the second named conductor beine' coniined beneath the head of said tubular element.-

la. An attachment plug comprising an insulating body having a passage therein, a

Yheaded tubular element disposed in said ing body, and a second conductor having electrical connection with said shell.

In testimony whereof l my signature.

NATHAN C. BUTLER. 

